Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 1 | /* $OpenBSD: atomicio.c,v 1.26 2010/09/22 22:58:51 djm Exp $ */ |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 2 | /* |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 3 | * Copyright (c) 2006 Damien Miller. All rights reserved. |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 4 | * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. |
Ben Lindstrom | 92a2e38 | 2001-03-05 06:59:27 +0000 | [diff] [blame] | 5 | * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include "includes.h" |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 30 | |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 31 | #include <sys/param.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 32 | #include <sys/uio.h> |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 33 | |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 34 | #include <errno.h> |
Darren Tucker | febf0f5 | 2007-06-25 22:15:12 +1000 | [diff] [blame] | 35 | #ifdef HAVE_POLL_H |
Darren Tucker | dc4a779 | 2007-06-25 22:08:10 +1000 | [diff] [blame] | 36 | #include <poll.h> |
Darren Tucker | 7c92a65 | 2007-09-27 07:00:09 +1000 | [diff] [blame] | 37 | #else |
| 38 | # ifdef HAVE_SYS_POLL_H |
| 39 | # include <sys/poll.h> |
| 40 | # endif |
Darren Tucker | febf0f5 | 2007-06-25 22:15:12 +1000 | [diff] [blame] | 41 | #endif |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 42 | #include <string.h> |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 43 | #include <unistd.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 44 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 45 | #include "atomicio.h" |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 46 | |
| 47 | /* |
Darren Tucker | 85f04c6 | 2003-08-03 00:05:58 +1000 | [diff] [blame] | 48 | * ensure all of data on socket comes through. f==read || f==vwrite |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 49 | */ |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 50 | size_t |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 51 | atomicio6(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n, |
| 52 | int (*cb)(void *, size_t), void *cb_arg) |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 53 | { |
Damien Miller | 7684ee1 | 2000-03-17 23:40:15 +1100 | [diff] [blame] | 54 | char *s = _s; |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 55 | size_t pos = 0; |
| 56 | ssize_t res; |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 57 | struct pollfd pfd; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 58 | |
Damien Miller | f5bbd3b | 2014-01-30 11:26:46 +1100 | [diff] [blame] | 59 | #ifndef BROKEN_READ_COMPARISON |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 60 | pfd.fd = fd; |
| 61 | pfd.events = f == read ? POLLIN : POLLOUT; |
Damien Miller | f5bbd3b | 2014-01-30 11:26:46 +1100 | [diff] [blame] | 62 | #endif |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 63 | while (n > pos) { |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 64 | res = (f) (fd, s + pos, n - pos); |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 65 | switch (res) { |
| 66 | case -1: |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 67 | if (errno == EINTR) |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 68 | continue; |
Damien Miller | ed626b4 | 2007-09-21 13:12:49 +1000 | [diff] [blame] | 69 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
Damien Miller | f5bbd3b | 2014-01-30 11:26:46 +1100 | [diff] [blame] | 70 | #ifndef BROKEN_READ_COMPARISON |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 71 | (void)poll(&pfd, 1, -1); |
Damien Miller | f5bbd3b | 2014-01-30 11:26:46 +1100 | [diff] [blame] | 72 | #endif |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 73 | continue; |
| 74 | } |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 75 | return 0; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 76 | case 0: |
Damien Miller | b253cc4 | 2005-05-26 12:23:44 +1000 | [diff] [blame] | 77 | errno = EPIPE; |
| 78 | return pos; |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 79 | default: |
Damien Miller | 3fd019e | 2006-03-15 11:29:51 +1100 | [diff] [blame] | 80 | pos += (size_t)res; |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 81 | if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { |
| 82 | errno = EINTR; |
| 83 | return pos; |
| 84 | } |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 85 | } |
| 86 | } |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 87 | return pos; |
| 88 | } |
| 89 | |
| 90 | size_t |
| 91 | atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) |
| 92 | { |
| 93 | return atomicio6(f, fd, _s, n, NULL, NULL); |
Damien Miller | 05ec5c6 | 1999-12-07 17:03:33 +1100 | [diff] [blame] | 94 | } |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 95 | |
| 96 | /* |
| 97 | * ensure all of data on socket comes through. f==readv || f==writev |
| 98 | */ |
| 99 | size_t |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 100 | atomiciov6(ssize_t (*f) (int, const struct iovec *, int), int fd, |
| 101 | const struct iovec *_iov, int iovcnt, |
| 102 | int (*cb)(void *, size_t), void *cb_arg) |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 103 | { |
| 104 | size_t pos = 0, rem; |
| 105 | ssize_t res; |
| 106 | struct iovec iov_array[IOV_MAX], *iov = iov_array; |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 107 | struct pollfd pfd; |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 108 | |
| 109 | if (iovcnt > IOV_MAX) { |
| 110 | errno = EINVAL; |
| 111 | return 0; |
| 112 | } |
| 113 | /* Make a copy of the iov array because we may modify it below */ |
| 114 | memcpy(iov, _iov, iovcnt * sizeof(*_iov)); |
| 115 | |
Damien Miller | 20d1694 | 2008-07-05 09:36:58 +1000 | [diff] [blame] | 116 | #ifndef BROKEN_READV_COMPARISON |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 117 | pfd.fd = fd; |
| 118 | pfd.events = f == readv ? POLLIN : POLLOUT; |
Damien Miller | 20d1694 | 2008-07-05 09:36:58 +1000 | [diff] [blame] | 119 | #endif |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 120 | for (; iovcnt > 0 && iov[0].iov_len > 0;) { |
| 121 | res = (f) (fd, iov, iovcnt); |
| 122 | switch (res) { |
| 123 | case -1: |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 124 | if (errno == EINTR) |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 125 | continue; |
Damien Miller | ed626b4 | 2007-09-21 13:12:49 +1000 | [diff] [blame] | 126 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
Damien Miller | 20d1694 | 2008-07-05 09:36:58 +1000 | [diff] [blame] | 127 | #ifndef BROKEN_READV_COMPARISON |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 128 | (void)poll(&pfd, 1, -1); |
Damien Miller | 20d1694 | 2008-07-05 09:36:58 +1000 | [diff] [blame] | 129 | #endif |
Darren Tucker | ab17f7d | 2007-06-25 19:04:12 +1000 | [diff] [blame] | 130 | continue; |
| 131 | } |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 132 | return 0; |
| 133 | case 0: |
| 134 | errno = EPIPE; |
| 135 | return pos; |
| 136 | default: |
| 137 | rem = (size_t)res; |
| 138 | pos += rem; |
| 139 | /* skip completed iov entries */ |
| 140 | while (iovcnt > 0 && rem >= iov[0].iov_len) { |
| 141 | rem -= iov[0].iov_len; |
| 142 | iov++; |
| 143 | iovcnt--; |
| 144 | } |
| 145 | /* This shouldn't happen... */ |
Damien Miller | b5ea7e7 | 2006-04-23 12:06:49 +1000 | [diff] [blame] | 146 | if (rem > 0 && (iovcnt <= 0 || rem > iov[0].iov_len)) { |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 147 | errno = EFAULT; |
| 148 | return 0; |
| 149 | } |
| 150 | if (iovcnt == 0) |
| 151 | break; |
| 152 | /* update pointer in partially complete iov */ |
| 153 | iov[0].iov_base = ((char *)iov[0].iov_base) + rem; |
| 154 | iov[0].iov_len -= rem; |
| 155 | } |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 156 | if (cb != NULL && cb(cb_arg, (size_t)res) == -1) { |
| 157 | errno = EINTR; |
| 158 | return pos; |
| 159 | } |
Damien Miller | 6aa139c | 2006-04-23 12:06:20 +1000 | [diff] [blame] | 160 | } |
| 161 | return pos; |
| 162 | } |
Damien Miller | 65e42f8 | 2010-09-24 22:15:11 +1000 | [diff] [blame] | 163 | |
| 164 | size_t |
| 165 | atomiciov(ssize_t (*f) (int, const struct iovec *, int), int fd, |
| 166 | const struct iovec *_iov, int iovcnt) |
| 167 | { |
| 168 | return atomiciov6(f, fd, _iov, iovcnt, NULL, NULL); |
| 169 | } |